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Type 2500
4. Set the process variable to the minimum value of
the input range as shown in Table 5. For constructions
with an indicator assembly, make sure that the pointer
is over the LOW mark.
In the following step, the alignment
screw (key 33, figure 19) always must
remain screwed in far enough to provide
spring tension on the underside of the
alignment screw head.
5. Adjust the flapper (key 32, figure 19) to obtain the
appropriate pressure listed below. For coarse flapper
adjustment, loosen the hex nut (key 40, figure 19) and
rotate the flapper assembly about the torque tube
shaft. For fine flapper adjustment, turn the flapper
alignment screw (key 33, figure 19).
For Direct Acting Type 2500, 2500T, 3 psig (0.2
bar) for a 3 to 15 psig (0.2 to 1.0 bar) output or 6 psig
(0.4 bar) for a 6 to 30 psig (0.4 to 2.0 bar)output.
For Reverse Acting Type 2500, 2500T, 15 psig
(1.0 bar) for a 3 to 15 psig (0.2 to 1.0 bar) output or 30
psig (2.0 bar) for a 6 to 30 psig (0.4 to 2.0 bar) output.
6. Visually examine the nozzle and flapper to ensure
the nozzle is as square as possible with the flapper.
The nozzle can be realigned by loosening the Bourdon
tube mounting screws (key 45, figure 19) and rotating
the Bourdon tube slightly. If the nozzle is realigned,
tighten the mounting screws and repeat step 5.
7. Set the process variable to the maximum value of
the input range as shown in table 5.
8. The output pressure should be:
For Direct Acting Type 2500, 2500T, 15 psig
1.0 bar) for a 3 to 15 psig (0.2 to 1.0 bar) output or 30
psig (2.0 bar) for a 6 to 30 psig (0.4 to 2.0 bar) output.
For Reverse Acting Type 2500, 2500T, 3 psig
(0.2 bar) for a 3 to 15 psig (0.2 to 1.0 bar) output or 6
psig (0.4 bar) for a 6 to 30 psig (0.4 to 2.0 bar) output.
9. If the output pressure agrees with that shown in
step 8, proceed to step 10. If the output pressure does
not agree, go to step 11.
10. If the unit does not contain an indicator assembly,
go to the Startup section. If the unit contains an indica-
tor assembly, change the pointer span by loosening
18
Note
the indicator plate screws (key 41, figure 19, detail of
indicator assembly), slide the plate until the HIGH
mark is under the pointer. Tighten the plate screws
and go to the Startup section.
Any sliding of the level set arm (key 28,
figure 19) in the following step changes
the zero as well as the output pressure
span.
11. To adjust the output pressure span, loosen the
two level set mounting screws (see figure 19) and
slide the flexure strip base (key 27) right or left along
the elongated slotted hole as follows:
To increase the output pressure span, slide the
flexure strip base away from the torque tube shaft.
To decrease the output pressure span, slide the
flexure strip base toward the torque tube shaft.
Retighten the screws. If the flexure strip base has
been moved as far as possible and the output pres-
sure span is still too large or too small, proceed to step
13.
12. Repeat the procedure from step 4 until the re-
quired calibration points are obtained.
Any change of the PROPORTIONAL
BAND or SPECIFIC GRAVITY adjust-
ment in the following step changes the
zero as well as the output pressure
span.
13. If the flexure strip base has been moved as far as
possible and the output pressure span is still too large
or too small, slightly adjust the PROPORTIONAL
BAND or SPECIFIC GRAVITY adjustment as follows:
If the output pressure span is too large, slightly
increase the PROPORTIONAL BAND or SPECIFIC
GRAVITY setting.
If the output pressure span is too small, slightly
decrease the PROPORTIONAL BAND or SPECIFIC
GRAVITY setting.
14. Repeat the procedure from step 4 until the re-
quired calibration points are obtained.
Note
Note
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